Fan filter



FIG. 1 is a perspective view of the fan filter showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof, the right side elevational view and the top plan view being identical thereto; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a fan filter, as shown and described. 